Answer: newme

AnswerCrossword Clue
NEWMEWhat a successful dieter might describe himself as
NEWME"It's the ..." ("I've changed")
NEWMEPerson after a lifestyle change, self-descriptively
NEWMEMoniker after a lifestyle change
NEWMESelf-description after a lifestyle change
NEWME"A Brand ..." (Dusty Springfield song)
NEWMEReinvented self-image
NEWMESelf-description after a major lifestyle change